Preheat the oven to 325 degrees F. Grease and flour a bundt pan.
Place the cake mix, 3 ounces cream cheese, 1 cup milk, eggs, 2 Tablespoons lemon zest, and 0.25 cup lemon juice into a large mixing bowl. Combine with an electric mixer on low speed for about one minute, scraping down the sides as needed.
Pour the mixture into the prepared bundt pan and smooth it evenly.
Bake for 45 minutes, or until a toothpick inserted in the center comes out clean.
Cool in the baking pan for 15 minutes before inverting onto a wire rack or plate to cool completely.
Prepare the frosting by creaming the 5 ounces of cream cheese and 1 teaspoon lemon zest together until smooth. Add the powdered sugar, 2 Tablespoons lemon juice, and 1 Tablespoon milk, mixing until well combined.
Drizzle or spread the frosting over the cooled cake before serving.
Notes
Ensure the cream cheese is fully softened before mixing to avoid lumps in your cake batter and frosting.